[windows] lenteur du systeme

Bonjour
j'ai constaté que mon PC est lent en execution merci de m'aider à regler ce probleme.
voici le rapport:
Logfile of HijackThis v1.99.1
Scan saved at 10:15:24, on 26/03/2007
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

Running processes:
D:\WINDOWS\System32\smss.exe
D:\WINDOWS\system32\csrss.exe
D:\WINDOWS\system32\winlogon.exe
D:\WINDOWS\system32\services.exe
D:\WINDOWS\system32\lsass.exe
D:\WINDOWS\system32\svchost.exe
D:\WINDOWS\System32\svchost.exe
D:\WINDOWS\System32\svchost.exe
D:\WINDOWS\System32\svchost.exe
D:\WINDOWS\system32\spoolsv.exe
D:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
D:\Program Files\Fichiers communs\Microsoft Shared\VS7DEBUG\MDM.EXE
D:\Program Files\rnamfler\naofsvc.exe
D:\WINDOWS\System32\svchost.exe
D:\WINDOWS\System32\wdfmgr.exe
D:\WINDOWS\Explorer.EXE
D:\Program Files\rnamfler\naomf.exe
d:\program files\rnamfler\radprcmp.exe
D:\Program Files\Mozilla Firefox\firefox.exe
D:\Program Files\Skype\Phone\Skype.exe
D:\Program Files\Skype\Plugin Manager\SkypePM.exe
D:\secur\HijackThis.exe

O4 - HKLM\..\Run: [wrna3ls] D:\Program Files\rnamfler\naomf.exe
O17 - HKLM\System\CCS\Services\Tcpip\..\{767DB229-C09D-4F9D-9C3D-CB0DBCD90013}: NameServer = 212.217.0.14 196.217.246.210
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - D:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - D:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: RdnaoFlSvc - Unknown owner - D:\Program Files\rnamfler\naofsvc.exe